CB Activity doesn't have a feature to add activity. It just shows their activity, it's not a stream. This will be improved more with each release as it moves towards a stream like capability, but for now it's display only.
As for CB ProfileBook wall tab, yes you can reply on their profile or you can just reply on your own making a post directly above theirs (if it's latest post otherwise your new post would just be at the top).
Kyle (Krileon)
Community Builder Team Member
Before posting on forums:
Read FAQ thoroughly
+
Read our Documentation
+
Search the forums
CB links:
Documentation
-
Localization
-
CB Quickstart
-
CB Paid Subscriptions
-
Add-Ons
-
Forge
--
If you are a Professional, Developer, or CB Paid Subscriptions subscriber and have a support issue please always post in your respective support forums for best results!
--
If I've missed your support post with a delay of 3 days or greater and are a Professional, Developer, or CBSubs subscriber please
send me a private message
with your thread and will reply when possible!
--
Please note I am available Monday - Friday from 8:00 AM CST to 4:00 PM CST. I am away on weekends (Saturday and Sunday) and if I've missed your post on or before a weekend after business hours please wait for the next following business day (Monday) and will get to your issue as soon as possible, thank you.
--
My role here is to provide guidance and assistance. I cannot provide custom code for each custom requirement. Please do not inquire me about custom development.